New Bigma v Canon 100-400
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I've had a Bigma 1 since it was first introduced and for the range it gives and cost it really is a winner. Bigma mark 2 has to be even better as for the stability at full zoom. This is now where my Mark 1 fails me hand held ( 74 years makes a big difference ) Having said all that if you mange to get a good Canon 100-400 (and there are some bad ones around even from new) I would go for it as it will perhaps hold it's price better.
John
John

Unless you really need the 50-150mm range (and don't have another lens to cover it) then think very seriously about the Sigma 150-500mm rather than the 50-500mm lens. I have been using the 150-500mm on a Nikon D3s and a D300 for almost a year now and have been hugely impressed by its sharpness and fidelity even to the very extreme of its range. My only very mild complaint is the slight noise from the OS system (but I have that switched off most of the time anyway as the high-ISO supremacy of the Nikons allows me to use fairly high shutter speeds and, of course, no VR/OS/IS system gives any benefit at speeds faster than about 1/500th anyway).